It's the difference between reading a newspaper you found on the street and reading it over a stranger's shoulder.
It's the difference between adding a few pieces during a game of chess against yourself and doing the same against someone else.
It's the difference between walking down a street and pushing someone aside to do that.
It's the difference between reading a book in the library and reading it in the bookstore.
You know what pisses me off far more than any advert in the world? The fact you have to register to read an article on the nytimes website. Can't be bothered. If the web can't monetize through advertising, expect far more moronic walled gardens.
But actually, I subscribe to the NYT, so registering for the site doesn't bother me. I'd rather get something I pay for than get a bunch of crap I don't want (ads) just to read an article.
Yup, I know this is "stealing". I don't care.